Agree to respectfully disagree.
But I think your Duke data backs up what I’m saying generally. Duke is nearly as competitive as Harvard, overall acceptance rate of 8%. Yet, they admitted 29% of Valedictorians!
Apply the same logic to Harvard – If, just like Duke, the acceptance rate for Valedictorians is 3-4x the overall acceptance rate, that would give OP a 9-12% acceptance chance.
That said… I do believe I erred. I misread, or might have been looking at something else… Could have sworn I read a 1550 SAT. With a 33 ACT, yes, that does diminish the chances. I may have been slightly too optimistic.